Science quiz class 9th

During summer, water kept in an earthen pot becomes cool because of the phenomenon of

• Diffusion

• Transpiration

• Evaporation

• Osmosis

Covert 25°C to Kelvin scale

• 273k

• 300k

• 289k

• 298k

Which condition out of the following will increase the evaporation of water?

• Increase in temperature of water

• Decrease in temperature of water

• Less exposed surface area of water

• Adding common salt to water

Evaporation is a surface phenomenon.

• True

• False

Boiling is a bulk phenomenon.

• True

• False

Which of the following has the strongest force of attraction at room temperature

• Water

• Oxygen

• Iron

• Bromine

Dry ice is

• Water in solid state

• Carbon dioxide in liquid state

• Carbon dioxide in solid state

• Water in gaseous state

Gases present in air have the same pressure throughout the entire atmosphere.

• True

• False

Evaporation of a liquid at room temperature leads to a ………….. effect

• Heating

• Cooling

Evaporation and boiling are the same processes because molecules move from a liquid to gaseous state.

• True

• False